我正在尝试使用 ab 测量 nginx 的性能。从本地计算机执行相同的 ab 可获得每秒请求数约为同一网络上的远程计算机的 10 倍的请求数。
Local results:
Server Software: nginx
Server Hostname: 192.168.0.116
Server Port: 8000
Document Path: /data/adpix/picture/test.jpg
Document Length: 4602 bytes
Concurrency Level: 1000
Time taken for tests: 1.475 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 49854651 bytes
HTML transferred: 46622862 bytes
Requests per second: 6778.38 [#/sec] (mean)
Time per request: 147.528 [ms] (mean)
Time per request: 0.148 [ms] (mean, across all concurrent requests)
Transfer rate: 33001.34 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 25 67 24.4 66 137
Processing: 28 73 24.9 71 146
Waiting: 13 42 19.7 40 110
Total: 75 140 17.9 139 182
现在从远程机器上：
Server Software: nginx
Server Hostname: 192.168.0.116
Server Port: 80
Document Path: /data/adpix/picture/test.jpg
Document Length: 4602 bytes
Concurrency Level: 1000
Time taken for tests: 14.422 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 51737663 bytes
HTML transferred: 48380826 bytes
Requests per second: 693.40 [#/sec] (mean)
Time per request: 1442.165 [ms] (mean)
Time per request: 1.442 [ms] (mean, across all concurrent requests)
Transfer rate: 3503.42 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 68 230 182.7 166 3052
Processing: 110 1113 2918.5 227 11862
Waiting: 20 648 2101.1 189 11451
Total: 246 1344 2898.0 387 11981
问题似乎出在连接时间上。
网络很快。Netperf 返回 80 Mb/s 两台机器都是托管在两台不同的物理机上的 VM，运行四核处理器。通过千兆交换机连接。
有人知道可能是什么问题吗？
感谢您的任何帮助。
答案1
这似乎很正常，只是由于数据包交换时间和光纤中的光速。是什么让你认为 1.442 毫秒“慢”？